Dozens of people were killed two weeks ago in rebel-held Douma

An international team of inspectors on Saturday entered the Syrian town of Douma to investigate a suspected chemical weapons attack that killed dozens of people two weeks ago and resulted in a retaliatory U.S.-led missile strike.

The fact-finding mission for the Organisation for the Prohibition of Chemical Weapons has had trouble securing permission from the Syrian government and Russian military forces to enter the area. A U.N. reconnaissance team that had entered Douma earlier this week turned back because of gunfire. But...